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Finding the Fourth Proportional to 1,690.21, 2,535.43 and 812.90

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Solution

The fourth proportional to 1,690.21, 2,535.43 and 812.90 is: 1,219.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.21 : 2,535.43 = 812.90 : x
  2. Step 2: Convert to fraction form
    1,690.21/2,535.43 = 812.90/x
  3. Step 3: Cross multiply
    1,690.21x = 2,535.43 × 812.90
  4. Step 4: Simplify right side
    1,690.21x = 2,061,051.05
  5. Step 5: Solve for x
    x = 2,061,051.05/1,690.21
  6. Step 6: Final answer
    x = 1,219.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.